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အကျဉ်းချုပ်
ဖော်ပြချက်Ice boat apparent wind on different points of sail.jpg
English: iceoat A is close hauled. Iceoat B is on a beam reach.Iceboat C is on a broad reach.
VT = True wind speed
VB = Boat speed
VA = Apparent wind speed
FT = Force on sail tangential to sail cord (lift component)
FR = Driving force component
FLAT = Lateral component
Note that as the iceboat sails further from the wind, the apparent wind becomes increases slightly and the boat speed is highest on the broad reach.
Source: P, 47
Title Physics of Sailing
Author John Kimball
Edition illustrated
Publisher CRC Press, 2009 ISBN142007377X, 9781420073775